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Roosters' internal clock makes them crow: Study
According to a study conducted in Japan, an internal clock, not sunlight, drives roosters to crow at the crack of dawn.
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Roosters' internal clock makes them crow: Study
According to a study conducted in Japan, an internal clock, not sunlight, drives roosters to crow at the crack of dawn.
Date: 3/19/13
Views: 2136
Video by:  MSN News/Newsy
 
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